Manuel of elementary field engineering field engineering pamphlet British booby traps / prepared under the direction of The Chief of the Imperial General Staff war department technical manual Engineer maintenance troops war department technical manual Standard stream crossing equipment / prepared under direction of the Chief of Engineers field manual Camouflage / Prepared under direction of the chief of engineers field manual Field fortifications / prepared under direction of the chief of engineers field manual Corps of engineers : field fortifications field manual Armored engineer battalion field manual Reference data / prepared under direction of the chief of engineers field manual Engineer troops field manual Operations of engineer field units field manual Corps of engineers : construction and routes of communication